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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hive.ql.parse;

import java.util.ArrayList;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;

/**
 * The input signature of a function or operator. The signature basically
 * consists of name, list of parameter types.
 * 
 **/

public class InputSignature {
  private final String name;
  private final ArrayList typeArray;

  @SuppressWarnings("unused")
  private static final Logger LOG = LoggerFactory.getLogger(InputSignature.class
      .getName());

  public InputSignature(String name) {
    this.name = name;
    typeArray = new ArrayList();
  }

  public InputSignature(String name, TypeInfo... classList) {
    this(name);

    if (classList.length != 0) {
      for (TypeInfo cl : classList) {
        typeArray.add(cl);
      }
    }
  }

  public InputSignature(String name, Class... classList) {
    this(name);

    if (classList.length != 0) {
      for (Class cl : classList) {
        typeArray.add(TypeInfoFactory
            .getPrimitiveTypeInfoFromPrimitiveWritable(cl));
      }
    }
  }

  public void add(TypeInfo paramType) {
    typeArray.add(paramType);
  }

  public String getName() {
    return name.toUpperCase();
  }

  public ArrayList getTypeArray() {
    return typeArray;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }

    InputSignature other = null;
    try {
      other = (InputSignature) obj;
    } catch (ClassCastException cce) {
      return false;
    }

    return name.equalsIgnoreCase(other.getName())
        && (other.typeArray.equals(typeArray));
  }

  @Override
  public int hashCode() {
    return toString().hashCode();
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append(getName());
    sb.append("(");
    boolean isfirst = true;
    for (TypeInfo cls : getTypeArray()) {
      if (!isfirst) {
        sb.append(",");
      }
      sb.append(cls.toString());
      isfirst = false;
    }

    sb.append(")");
    return sb.toString();
  }
}